Non-pneumatic tire

Abstract

A non-pneumatic tire ( 1 ) includes an attachment body attached to an axle, a ring-shaped body ( 13 ) configured to surround the attachment body from the outside in a tire radial direction, a connecting member ( 15 ) configured to connect the attachment body and the ring-shaped body while allowing displacement therebetween, and a cylindrical tread member ( 16 ) installed outside the ring-shaped body, wherein an outer circumferential surface of the tread member has a plurality of curved surface sections ( 41 ) to ( 42 ) that are continuously formed in a tire width direction (H) with no step difference and formed in a shape protruding outward in the tire radial direction when seen in a cross-sectional view in the tire width direction, the plurality of curved surface sections have different radii of curvature in the tire width direction when seen in the cross-sectional view, and in the plurality of curved surface sections, and intermediate curved surface sections ( 42 ) disposed between a central curved surface section ( 41 ) disposed at a central portion in the tire width direction and shoulder curved surface sections ( 43 ) disposed outside in the tire width direction have a radius (R 2 ) of curvature larger than radii of curvature (R 1 ) and (R 3 ) of the other curved surface sections when seen in the cross-sectional view.

1 . A non-pneumatic tire comprising:
 an attachment body attached to an axle;   a ring-shaped body configured to surround the attachment body from the outside in a tire radial direction;   a connecting member configured to connect the attachment body and the ring-shaped body while allowing displacement therebetween; and   a cylindrical tread member installed outside the ring-shaped body,   wherein an outer circumferential surface of the tread member has a plurality of curved surface sections that are continuously formed in a tire width direction with no step difference and formed in a shape protruding outward in the tire radial direction when seen in a cross-sectional view in the tire width direction,   the plurality of curved surface sections have different radii of curvature when seen in a cross-sectional view in the tire width direction, and   in the plurality of curved surface sections, intermediate curved surface sections disposed between a central curved surface section disposed at a central portion in the tire width direction and shoulder curved surface sections disposed outside in the tire width direction have a radius of curvature larger than radii of curvature of the other curved surface sections when seen in the cross-sectional view.   
     
     
         2 . The non-pneumatic tire according to  claim 1 , wherein the shoulder curved surface sections of the plurality of curved surface sections have a radius of curvature smaller than radii of curvature of the other curved surface sections when seen in the cross-sectional view. 
     
     
         3 . The non-pneumatic tire according to  claim 1 , wherein a distance in the tire width direction between a center plane passing through a center in the tire width direction of the tread member and a first outer end portion in the tire width direction of the central curved surface section is ⅔ or less of a distance in the tire width direction between the center plane and a second outer end portion in the tire width direction of the shoulder curved surface section. 
     
     
         4 . The non-pneumatic tire according to  claim 1 , wherein an outer edge in the tire width direction of the tread member is disposed at the same position in the tire width direction or disposed inside in the tire width direction with respect to the outer edge in the tire width direction of the ring-shaped body.